Retirement Benefit Plans - Expected Future Plan Benefit Payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Schedule of Expected Future Pension Benefit Payment [Line Items]
2015	$ 20,171
2016	21,247
2017	22,150
2018	23,260
2019	23,935
2020-2024	135,435
Total	246,198
Pension Benefits [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
2015	18,617
2016	19,744
2017	20,744
2018	21,863
2019	22,505
2020-2024	128,044
Total	231,517
Post-retirement [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
2015	1,554
2016	1,503
2017	1,406
2018	1,397
2019	1,430
2020-2024	7,391
Total	$ 14,681

Defined benefit plan expected future benefit payments.

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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